Sprayed_Polyurethane_Foam_Roofing_System_Over_Tar_and_Gravel.pdf

This document is a comprehensive guide specification for a Sprayed Polyurethane Foam (SPF) Roofing System for the City of Edinburgh, detailing technical requirements for a high-tensile acrylic elastomeric coating applied over tar and gravel roofing. The specification outlines detailed requirements for contractors and manufacturers, including mandatory qualifications such as a minimum of ten years of experience in polyurethane foam roofing system installation, proof of general liability insurance, and specific technical capabilities. Contractors must have performed at least five similar roofing applications and must coordinate work with the owner's representative, while manufacturers must have been in business for at least ten years and maintain a minimum of $5,000,000 in product liability insurance.

The specification provides explicit technical guidelines for surface preparation, environmental conditions for application, foam application procedures, and protective coating requirements. Specific technical details include a minimum foam thickness of 2.0 inches, application restrictions based on wind velocity and temperature, and a multi-layer coating process involving base, mid, and top coats with precise application rates and thicknesses. The document mandates the use of specific products from Global Polymer Systems, including primers, foam, and elastomeric coatings, and concludes with a requirement for a twenty-year NDL (No Dollar Limit) System Labor and Material Warranty. The roofing system is designed to protect against ultraviolet light degradation and adverse weather conditions, with detailed specifications for surface texture, coating application, and final granule treatment.